need subwoofer specifications

Since this sub is designed solely for use in a sealed box, some parameters are not necessary for you to find or test for.  Just a workup with Fs, Qts and Vas will provide enough to build a box.  You may not be able to find info on Xmax, and if not you won't know how large you can build the box airspace and still provide damage control to this driver.  A better response curve is found with a 3+ cu ft box but according to Crutchfield information the recommended size is 1.5 cu ft net.  This puts a bit of a peak in the response but not out of the ordinary for car audio, and is likely intended to provide stiffer damping to protect from overexcursion.  When building the box, allow about 0.12 cu ft for driver displacement.

Connect the two voice coils in series and you will have a 4 ohm sub.  To do that, run a jumper wire from coil 1 neg to coil two pos.  This 4 ohm load can be bridged to your two channel amp and output will be along the lines of the spec'd 1X800watts.  If you have a faulty amp channel you will need to have it looked at.  But go through complete gain setting procedures first with the correct hookup.

(BTW, with one DVC2 ohm sub it is not possible to have bridged the amp with a 2 ohm load...unless you used only one coil - one set of terminals - on the sub.  If you had the sub connected to only one channel, it wasn't bridged.)